Power-transmitting mechanism.



H. R. STUART.

POWER TRANSMITTING MECHANISM. APPLICATION FILED rm. 26. 1918.

1,288,270., Patented Dec. 17, 1918.

WITNESSES. I I/VVENTOR.

, WQY

ATTOR/VE ill lid

PQWEBrTBANSMITTING MECHANISM.

Specification of Letters Patent.

Fatented Men. 117, idle Application filed February 26, 191%. Serial Ho.219,177.

To all whom it may concern:

Be it known that I, Hanvn R. STUART, a citizen of the United States,residing at Springfield. in the county of Clark and State of Ohio, haveinvented certain new and useful Improvements in Power-TransmittingMechanism, of which the following is a full, clear. and exactdescription.

This invention relates to power transmitting mechanism for coolin fans,adapted to be thrown into and out operation automatically or manually asoccasion requires, the object being to provide a device of thischaracter adapted for use particularly on automobiles where the spacerequired for the radiator fanis limited and a compact, sturdy andreliable mechanism is required. in accordance with my invention, the tanwhich is usually mounted upon a stub shaft at the forward end of themotor, is associated with a continuously rotating pulley, at'rictionally driven armature disk adapted to slide upon a sleeve orhollow shaft carrying the tan, a spring arranged to hold the disk inengagement with the pulley and a concentric electro-magnet which, whenenergized. opposes the action of the spring, all

as will be hereinafter fully described in connection with theaccompanying drawings.

Figure l is a side elevation of my improved power transmitting device;an

'Fig. 2 is a longitudinal central section thereot.

1 indicates a non-rotating shaft suitably equipped at one end (the righthand end, as illustrated) for attachment to the forward end of the motorcasting of an anionic bile. able portion of its length is a sleeve orhollow shaft 2 which is adapted to rotate upon the shaft by means of twosets of ball hearinns 3 and 4. Upon the left hand end of this hollowshaft is screw threaded a hub or collar 5 lined by means of a set s rew6. the end of which is covered bya dust cap 7. Upon this hub or collaris mounted the fan blade 8 to which power is to be transmitted. The.opposite end of the hollow shaft or sleeve is enlarged in diameterforming a shoulder 9 between which and the end ol'f the hub 5., ismounted a pulley or wheel lll havinc a suitable bearing upon the outsideof the hollow shaft. U on that part of the hollow shaft of lar eriameter. is mounted a disk ll connected to the hollow shaft means of aspline 12, which permits the the z Surrounding this shaft for aconsider-- to slide longitudinally upon the shaft. lhis disk is composedof an iron portion 13 constituting the armature of an electromagnetpresently to be described, and a brass or non-magnetic portion 14c. Thatface of the disk adjacent the wheel is equip ed with leather or othersuitable frictional material which is ada ted to engage with the side ofthe pulley 10. Against the o osite face of the disk rests a coil spring16 which surrounds the larger portion of the hollow shaft and bears atits opposite end against a flange 17 formed upon or carried by thehollow shaft. This spring is constantly under tension tending to forcethe disk against the pulley. Surrounding the rear end oi the hollowshaft is a concentric electromagnet, the iron magnetic circuit of whichis indicated by 18, having the polar faces 19, and the .coil or windingby 20. This electromagnet is mounted upon the non-rotating shaft 1 andis held stationary therewith by the pin 21. Two binding posts, of whichonly one, 22, is shown, are provided for the terminals of the coil 90.The iron portion of the dish ll bridges across the two polar faces l9and is subiected to the magnetic attraction thereof.

Between these polar faces and the face ot the disk is a clearance ofabout one-sixteenth of an inch providing for a movement to that extentof the armature dish between the poles of the magnet and the face of thepulley. Between the interior wall of the hollow shaft and the surface ofthe fixed shaft 1 and outside of the ball bearing 3,'is placed a greasedam consisting of a ring 23 carrying a felt washer 2 1 which bears uponthe surface of the fixed shalt; this prevents grease from passing out ofthe space inside of the hollow shaft. This grease which is required forlubricating the various relatively moving surfaces is supplied throughaxial and transverse borings shown in dotted lines from a grease cupscrewed into the tapped opening 25.

This apparatus operates as follows: The pulley or wlusel 10 is to becontinuously driven b a belt or gear by the motor of the automobile orany special motor provided for the purpose. Normally the magnet will bedeiinergized and the spring 16 will'hold the disk ll in frictionalengagement with the pulley so that the rotary motion of the bi l.

pulley will be transmitted through the disk will continue until. it is30 that she fan shall size a will be @3191 circuit either manually 01'auiomaiicaliy; the armature disk Wil be naming mechanism, n awn-rewiringshaft, a hollow s 2ft inclosing the same, rmatum isl. mounted to rotateengagement with the wheel 10 in G L s-sitim iiving' Wheel and t0 thespring 1-6, and will be be}. $0.31. izlar maunted opposim ith face 6% 010f sci disk, a spring are; thma will 9 51 2; 8585i 2, the hOHQW qmckly bo is; 22 the latter toward staiianary t0- anism, 01

bina'iian @f shaft an @na

